Evaluation of Selected Pigeonpea (Cajanus cajan (L.) Millsp.) Genotypes for Resistance to Insect Pest Complex in Dry Areas of North Rift Valley, Kenya

Cheboi, J. J.; Kimurto, Paul; Kinyua, M. G.; Kiplagat, Oliver; Towett, B.K.; Kiptoo, Judith Jeruto; Kirui, Stella C.; Kimno, S. K.; Gangarao, N. V. P. R.

doi:10.9734/ajea/2016/22216

Cited by 6 publications

(5 citation statements)

References 6 publications

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“…This also suggests that the varieties were more adapted to the micro-environment under strip intercropping to efficiently utilise the growth factors such as light, water, nutrients and space to produce more branches, pods, and a higher grain yield than the mixed intercropping. Similar significant variations in pigeonpea varieties for different yieldattributes were reported in previous studies (Cheboi et al 2016;Hardev 2016;Sujatha and Babalad 2018;Thanga et al 2019). In this study, three varieties (ICEAP 01101-2, ICEAP 00604, and ICEAP 001284) produced a higher number of primary branches, pods per plant, and higher grain yields during both seasons.…”

Section: Discussionsupporting

confidence: 87%

Performance and Economic Prospect of Pigeonpea Varieties in Pigeonpea-Maize Strip Intercropping in Limpopo Province

Asiwe¹

2021

IJAB

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Pigeonpea is an important grain legume, and is traditionally intercropped with maize in West Africa and India. Small farmers in Limpopo Province, South Africa, who cultivate pigeonpea landraces under traditional mixed intercropping, experience the challenge of low productivity. Strip intercropping is a novel cropping system has greater efficiency and productivity in resource utilization when compared to mixed intercropping. Therefore, this study was conducted to evaluate the performance of improved pigeonpea varieties under a pigeonpea-maize strip intercropping system. Five pigeonpea varieties (ICEAP 001284, ICEAP 00604, ICEAP 87091, ICEAP 00661 and ICEAP 01101-2) were intercropped in maize as mixed and strip intercropping during the 2015–2016 and 2016/2017 cropping seasons while monocrops of both crops were also maintained as control. The trial for each season was replicated three times in a split plot design. During both seasons, ICEAP 001284 and ICEAP 00604 exhibited the shortest number of days to attain 50% flowering under strip intercropping and monocropping when compared to the remaining varieties. Higher significant (P < 0.05) grain yields (1726 kg ha-1, 1478 kg ha-1 and 858 kg ha-1 were obtained under strip intercropping for ICEAP 001284, ICEAP 01101-2 and ICEAP 00604, respectively during 2016/2017 than their respective grain yields during 2015/2016 season. Strip intercropping out-performed mixed intercropping with a higher land equivalent ratio and cash returns due to its ripple effect in the enhanced yield components. Among the five pigeonpea varieties, ICEAP 001284, ICEAP 00604 and ICEAP 01101-2, performed exceedingly well in their crop mixtures. In conclusion, the three pigeonpea varieties were selected for cultivation under strip intercropping. Strip intercropping exhibited greater efficiency in resource utilization and productivity over mixed intercropping in terms of grain yield, land equivalent ratio, net profit, and benefit-cost ratio. © 2021 Friends Science Publishers

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Section: Discussionsupporting

confidence: 87%

Performance and Economic Prospect of Pigeonpea Varieties in Pigeonpea-Maize Strip Intercropping in Limpopo Province

Asiwe¹

2021

IJAB

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“…However, damage to the reproductive parts, particularly the flowers and developing seeds, results in direct yield and economic losses. To investigate the genotype-specific response to the pod borer infestation, we conducted an insect bioassay on the cultivated susceptible cultivar KAT 60/8 (CT) [ 26 ] and a resistant wild relative accession (WT) [ 5 ] using the whole plant and detached leaves assays. Four-week-old seedlings and detached leaves were subjected to H. armigera infestation for a period of 24 h. The results show severe defoliation in CT, while minimal leaf damage was observed on the wild relative seedlings under the whole plant and petri plate assays ( Figure 1 A,B).…”

Section: Resultsmentioning

confidence: 99%

Comparative Analysis Delineates the Transcriptional Resistance Mechanisms for Pod Borer Resistance in the Pigeonpea Wild Relative Cajanus scarabaeoides (L.) Thouars

Njaci

Ngugi-Dawit

Oduor

et al. 2020

IJMS

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Insect pests pose a serious threat to global food production. Pod borer (Helicoverpa armigera (Hübner)) is one of the most destructive pests of leguminous crops. The use of host resistance has been an effective, environmentally friendly and sustainable approach for controlling several agricultural pests. The exploitation of natural variations in crop wild relatives could yield pest-resistant crop varieties. In this study, we used a high-throughput transcriptome profiling approach to investigate the defense mechanisms of susceptible cultivated and tolerant wild pigeonpea genotypes against H. armigera infestation. The wild genotype displayed elevated pest-induced gene expression, including the enhanced induction of phytohormone and calcium/calmodulin signaling, transcription factors, plant volatiles and secondary metabolite genes compared to the cultivated control. The biosynthetic and regulatory processes associated with flavonoids, terpenes and glucosinolate secondary metabolites showed higher accumulations in the wild genotype, suggesting the existence of distinct tolerance mechanisms. This study provides insights into the molecular mechanisms underlying insect resistance in the wild pigeonpea genotype. This information highlights the indispensable role of crop wild relatives as a source of crucial genetic resources that could be important in devising strategies for crop improvement with enhanced pest resistance.

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“…This may be contributed by presence of morphological traits or biochemical factors that influence selection or preference of pod borer among genotypes. Cheboi et al, 2016 reported potential yield among seven genotypes with low pod and seed damage. Similarly, Pod borer damage was high in Marigat (hotspot area) compared to other studied areas.…”

Section: Phenotypic Data On Mechanisms Of Pod Borer Resistancementioning

confidence: 99%

Assessment of phenotypic and genetic variation against pod borer among a subset of elite pigeonpea (Cajanus cajan) genotypes in Kenya

Cheboi¹,

Kinyua²,

Kimurto³

et al. 2019

Aust J Crop Sci

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Molecular marker information supported by quality morphological data facilitates the choice of suitable parents for applied breeding. The main aim of this study was to assess genetic diversity among 55 cultivated yield elite pigeonpea lines using 21 simple sequence repeat (SSR) markers that are well distributed across the genome. Among the 55 pigeonpea genotypes, 16 medium duration were selected and evaluated in the field for response to pod borer resistance in varied agro-ecological zones of Kenya during long rains of April-October cropping season Twenty one primer pairs detected 80 alleles with a mean of 3.9 alleles per locus and polymorphism information content (PIC) ranging from 0.09 to 0.75 averaging to 0.39 suggesting a low genetic diversity. However, marker CcM1820 revealed the highest number of alleles (9) with a PIC value of 0.75. The genotype response to pod borer attack was significant (P≤0.05) with three genotypes (ICEAPs 01541, 01154-2 and 00902) revealing tolerance to pod borer. The markers based on Neighbor Joining, grouped the 55 genotypes into three main clusters based on parentage selection. Most genotypes developed from ICEAP 00068 as the maternal parent were grouped in Cluster I while cluster II comprised of improved genotypes and cluster III comprised genotypes developed from ICPL 87091 as maternal parent. The resistant genotypes identified in the field experiment were grouped in cluster I except ICEAP 00902 which grouped in cluster II. Future studies should focus on broadening genetic base by including more landraces and wild relatives to maximize selection and improve breeding work.

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Evaluation of Selected Pigeonpea (Cajanus cajan (L.) Millsp.) Genotypes for Resistance to Insect Pest Complex in Dry Areas of North Rift Valley, Kenya

Cited by 6 publications

References 6 publications

Performance and Economic Prospect of Pigeonpea Varieties in Pigeonpea-Maize Strip Intercropping in Limpopo Province

Performance and Economic Prospect of Pigeonpea Varieties in Pigeonpea-Maize Strip Intercropping in Limpopo Province

Comparative Analysis Delineates the Transcriptional Resistance Mechanisms for Pod Borer Resistance in the Pigeonpea Wild Relative Cajanus scarabaeoides (L.) Thouars

Assessment of phenotypic and genetic variation against pod borer among a subset of elite pigeonpea (Cajanus cajan) genotypes in Kenya

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